Air cannon shoots bottle at Mach1 (speed of sound)

[Oetzrock]

N scheiss is das schallgeschwindigkeit nicht mit PVC junge

[PressuredAirCannon]

@ daltonultra, totally agreed.

Also, if it was going that fast, then that wimpy little piece of plywood would have done almost nothing to stop the bottle.... It would have gone clean thru the wood, as well as the wall behind it.

Not even close to the speed of sound.

[daltonultra]

Sorry, no, you weren't even close to the speed of sound. Not at 100psi. Not with ANY pressure a PVC air cannon can hold. Guys have been trying it for a long time with steel, and nobody has shown any conclusive proof that they've done it with pressures as high as 600psi. Besides, if you DID mange to get a projectile that size up to supersonic, the muzzle blast inside a room would pop your eardrums like soap bubbles.

[13098519]

lol for having it aimed at the door... can you imagine someone walking in at the wrong moment...

[headphones222]

I am also in the U.K., looking to get into spud guns, pneumatic is obviously the way to go, I live just outside high wycombe, where can I get copper piping and QEV's ect??

I noticed your cannon was platic?

[frog45678]

the chrony is in the dark so to speak ,im sorry but i think the shot was 400 fps tops. unless u had the bottle packed with lead. I dont think nasa could get a bottle moving 1150fps.. sorry,good video though

[Gippetos]

Certainly packs a punch, but I do believe that the muzzle blast is interfering with your chrony. Check your owners manual to be sure, but mine says 5 feet minimum for a .22lr. I think you've got more muzzle blast than that. :)

[hoarp001]

Well possibly. You would think that if the blast was going this fast, then the bottle would be as well.

I have borrowed a High speed camera (up to 1.4 million frames a second) so will do some mythbusters style testing to see the true speed.

[fruitpoops]

Certainly not 1.4 million frames per second, maybe 1400.

[hoarp001]

No, 1.4 million frames per second.

Vision Research Phantom v710. Do some googling.

[fruitpoops]

I know it's possible, Vision Research isn't the first company to produce a camera with that kind of capability. But the resolution will be absolute shit, and virtually unusable.

...

I did some googling, resoultion at 1.4 million fps = 128x8!

[hoarp001]

Yes, the resolution is low, but the speeds we shoot at, we are using 50,000fps. Your first post said certainly not 1.4million FPS, and that camera certainly is capeable of 1.4million fps, weather you can see what your shooting or not!

[fruitpoops]

Although it may be capable, the resolution is crap, which is my qualm. they are basically using the number as a selling-point

[snowyphil65]

@hoarp001 not true about the gasses, consider that its building a pressure wave behind the bottle and as it comes out it wants to expand and that it does rather rapidly, some of the gasses could be traveling faster than the bottle, would love to see that super slow mo

[Gippetos]

The results of the video will be interesting, and should be conclusive. My understanding is that muzzle blast actually overtakes the projectile for the first few feet. This was pointed out to me when I posted my own (I thought) mach speed video.

[Ammoboy9]

i made a air gun that holds 420 psi

[hoarp001]

The cannon and valve in this video is built to be efficiant enough to reach these speeds with just 80psi. There is no need for 420psi sometimes.

[qJwOeHrNty]

Its funny how ignorant some of you people can be because the water bottle has not nearly enough space to crate a sonic boom, and yes a bullet makes a sonic boom strait out of the barrel but mind the fact that a bullet usually travels substantially more faster than the speed of sound.

[StevoElsupremo]

you could kill someone with that

[hoarp001]

Yes, you could. its pretty dangerous.

[airf0x2009]

nice!!!!!!!

[Joemama85916]

It is over the speed of sound....1120 fps = 763.6363636363636 mph. (non-terminating) Check it anywhere. I Doubt his speed thing lies. So, technically it is over the speed barrier. It doesn't produce a sonic boom due to its small size. When a whip cracks, it isn't as loud as the sonic boom everyone comes to expect. I'm sure this made a sound louder than a cracked whip, if we were there to listen to it well.

[CarlJohnson3]

A bullet is a LOT smaller than that bottle and it makes a pretty decent sonic boom.

[Joemama85916]

That is because the bullet may be traveling at a much higher speed than the bottle.

[CarlJohnson3]

Anything that breaks the sound barrier would make a sonic boom. Especially a bottle.

[Joemama85916]

As i said before, it most likely made a small boom, that we couldn't distinctly hear due to the quality of the audio recording.

[Joemama85916]

As i said before, it most likely made a small boom, that we couldn't distinctly hear due to the quality of the audio recording.

[sjonesy113]

the speed of sound is 1125 fps or 768 mph that is why there is no sonic boom. the bottle did not break the sound barrier

[slopedarmor]

the speed of sound differs, the higher you are the lower that is... But I don't think this bottle broke through the sound barrier... close though.

[CarlJohnson3]

There is no way that is over the speed of sound. First of all, there was no sonic boom. If you broke the sound barrier, there would be a sonic boom. Second of all, I'm fairly certain your chronograph measures in Feet Per Second, not Miles Per Hour.

[CarlJohnson3]

Sorry, forget about the FPS part, I didn't watch the part where it shows the FPS. But still, there was no sonic boom.

[hoarp001]

Well a small thing like this does produce a sonic boom (like a whip cracking) but the sound of the gun, object falling over etc etc etc would have masked it. The chrono is calibrated and an accurate piece of equipment, and all the stats and calculations suggest that the cannon is capable of supersonic, so I am believing it.

[rbcoh]

i dont think thats mach 1 otherwise there deffinatly would have been a sonic boom

[nibbler125]

surprized there wasnt a sonic boom

[hessy11]

wow its amazing what a bottle can do a these speeds

[hoarp001]

Yes I have since shot a bottle at steel plate and had some very impressive results...

[mattsvideoproduction]

"Luckily empty coke bottles fit nicely in the barrel."

If there full are they bigger?

[hoarp001]

if they are full of coke then yes, as the pressure inside swells them out. I have now started to put about two inches of water in the bottle to give it some mass. Ive made a right mess of some steel sheets with these bottles...

[phreaksterman]

Holy lord.